Earlier today we mentioned that Thunderbird 3 Beta 3 is available for download, and it got us thinking: There was a time, in the earlier days of Firefox, when the two open-source applications shared a lot of the Mozilla limelight. Now Firefox is clearly enjoying a time in the sun, but Thunderbird, for whatever reason, isn't. We'd suspect a lot of it has to do with users who've become accustomed to handling their email on the web, but whether or not that's the case, we're wondering: